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Old 2006-01-07, 10:21   #1
bayanne
 
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"Tony Gott"
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Question Calculation of P90 time for each exponent

I had a quick look but couldn't find anything quickly.

What is the formula for working out the number P90 cou years by exponent?

I am looking through the number of bad results and thought it would be instructive to know how much time has actually been lost by the submission of results by team/producer, which have later provided to be incorrect.
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Old 2006-01-07, 10:33   #2
jinydu
 
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This question was already answered in earlier threads. The Team Prime Rib website has a calculator that calculates the number of CPU years that GIMPS awards for any given exponent. And buried somewhere deep inside this forum is the explicit formula (actually different formulas are used for different ranges); I would know because I asked this question a long time ago and it was answered.
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Old 2006-01-07, 10:34   #3
ValerieVonck
 
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And is it also possible to calculate the P90 (months, years, ...) time for other numbers like:

13236795*2^215582 - 1 is prime! 64904 digits
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Old 2006-01-07, 10:44   #4
bayanne
 
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I am aware of the calculator, but I was after the formula, as I have 853 exponents to evaluate .......
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Old 2006-01-07, 15:38   #5
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Found it!

http://www.mersenneforum.org/showthr...&highlight=P90

Scroll down to Post #8 by Joe_O.

Quote:
Originally Posted by CedricVonck
And is it also possible to calculate the P90 (months, years, ...) time for other numbers like:

13236795*2^215582 - 1 is prime! 64904 digits
I think that would depend on what program you use (and you can't use Prime95 for that).

Last fiddled with by jinydu on 2006-01-07 at 15:39
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Old 2006-01-07, 15:54   #6
bayanne
 
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Many thanks for the link ....
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